Hello expat, and welcome to the Monastery!

Use the addFileOrDirectory method and set zipName to the desired destination:

#! perl
use strict;
use warnings;
use Archive::Zip qw( :ERROR_CODES :CONSTANTS );

my $dirname  = 'Foo/';
my $filename = 'Bar.txt';
my $zip      = Archive::Zip->new();

$zip->addDirectory($dirname);
$zip->addFileOrDirectory( { name    => $filename,
                            zipName => $dirname . $filename } );
$zip->writeToFileNamed('test.zip') == AZ_OK
    or die "Write error: $!";
[download]

Hope that helps,